JPH06221097A - Tunnel constructing method - Google Patents

Abstract

PURPOSE:To efficiently transport a segment and steel plate simultaneously when the steel pipe is laid on the inner side of lining. CONSTITUTION:Respective gate-shaped girders 11 are temprorarily built in at a predetermined pitch in a tunnel cavity 9 in the form following a shieled device 5, so that a steel plate transport line 9b and segment transport 9a are formed in regions different from each other. A steel plate 61 and segment 31 are respectively transported by traveling steel plate and segment transport trucks 27, 26 and the segment 31 and steel plate 61 are circumferentially of the tunnel connected to each other with an erector 51 of the shield device 5 and a steel pipe erector 20 following the same, so that the construction of lining 3 and a steel pipe 6 can be simultaneously efficiently progressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel construction method suitable for constructing an underground river tunnel.

[0002]

2. Description of the Related Art Conventionally, in a shield tunnel, a segment made of concrete or the like is lining by connecting a plurality of segments along the tunnel circumferential direction so that the earth pressure applied from the outer peripheral side can be supported as an external pressure. There is a way to build. By the way, recently, as a flood prevention measure in urban areas, a tunnel has been constructed in a relatively deep underground by the shield construction method, and when raining, the amount of rainwater exceeding the drainage capacity of rivers, drainage channels, etc. It has been proposed to prevent rainwater from spilling over the ground by treating the wastewater as an underground river. In such underground river tunnels, it is expected that a large internal pressure will occur in the tunnel cross section due to the water head difference or the water pressure due to the impact of the inflow of rainwater. Therefore, when the internal pressure is applied, tensile force acts on the lining along the tunnel circumferential direction, and as a result, the tightened state of bolts between adjacent segments is applied to the tensile force. It is expected that there is a risk that the segment joint part, that is, a part of the lining will be broken in the form of breaking without being able to withstand it, leading to water leakage. Therefore, a method of forming the inner pressure supporting lining separately from the outer pressure supporting segment lining by building some kind of rigid member such as steel plate, steel pipe, etc. on the inner side of the cross section of the lining by the segment is considered. Is being done.

[0003]

In a shield tunnel, however, concrete segments are connected by bolts or the like by excavating earth and sand through a shield device and following the excavation of the earth and sand inside the shield device. By arranging multiple in the circumferential direction of the tunnel,
In order to form the tunnel lining, in the cross section of the tunnel under construction, a trolley for carrying out excavated earth and sand and a segment for carrying in segments goes and goes between the wellhead part such as a shaft and the shield device position. , Blocking the tunnel space,
The situation is such that further transport work is not allowed. That is, in order to install the lining member for supporting the internal pressure as described above on the inner side of the tunnel lining, the lining member must be transported to the built-in position. It takes a form of waiting until the work of carrying out the sediment and carrying in the segment is completed. Therefore, excavation and erection of the segment and erection of the internal pressure support lining interfere with each other's transfer work, and it is not possible to proceed these at the same time, which delays the construction period. is expected. Therefore, in view of the above circumstances, the present invention enables the building of a lining for supporting an external pressure and the building of a lining member for supporting an internal pressure on the inner side of the lining to be efficiently advanced at the same time. It provides a tunnel construction method.

[0004]

That is, according to the present invention, the first lining (3) is constructed in a form capable of supporting the earth pressure by the ground (2), and the first lining (3) is In a tunnel construction method for constructing a second lining (6) on one side in a form of connecting a plurality of rigid members (61) along an inner peripheral surface (3a) of the first lining (3), A transfer line support member (11) is formed in the tunnel space (9) formed on the inner side of the first lining (3), and a rigid member transfer region (9b) is formed above the tunnel space (9). In addition, the segments (31) are temporarily installed by a predetermined pitch so that the segment transfer regions (9a) can be formed below the rigid member transfer region (9b), and the segments (31) are fixed by the transfer line support member (11). The segment transfer means (26) is capable of moving back and forth in the formed segment transfer area (9a). And conveyed in the tunnel axis direction while to build the first lining (3)
The rigid member (61) is replaced with the transport line support member (1
The second lining (6) is conveyed in the axial direction of the tunnel while being supported by the rigid member conveying means (27) which can move freely in the rigid member conveying region (9b) formed by 1). Configured as you build. The numbers in parentheses () indicate the corresponding elements in the drawings for the sake of convenience, and therefore the present description is not limited to the description in the drawings. The same applies to the following action columns.

[0005]

With the above construction, according to the present invention, during the tunnel construction work, the segment (31) is transported in the tunnel space (9) in such a manner that the segment transport area (9a) moves back and forth to the segment transport means (26). The rigid member transport means (27) acts to transport the rigid member (61) in such a manner that the rigid member transport region (9b) moves back and forth.

[0006]

1 is a sectional side view showing an example of a tunnel being constructed by a tunnel construction method according to the present invention, and FIG.
II, II sectional drawing, and FIG. 3 is a fracture | rupture perspective view of the tunnel shown in FIG.

The tunnel 1 for the underground river under construction is shown in FIG.
Or, as shown in FIG. 2, it has a lining 3 formed in a rollover cylindrical shape in the ground 2 so as to extend in the direction of arrow A, B which is the excavation direction. In the excavation tunnel 2s formed in the ground 2 in the shape of an overturning cylinder by the shield device 5 as the excavation means, the excavation tunnel 2
It is formed and constructed in the shape of a rollover cylinder along the outer circumference of s. The lining 3 has a plurality of segments 31, which are connected to each other through the erector 51 of the shield device 5 so as to form an annular shape in a line along the tunnel circumferential direction shown by arrows C and D in FIG. 1. The ring width of the one ring has a width L1 in the directions of arrows A and B, which are the direction of the tunnel axis shown in FIG.
Predetermined winding thickness L in the direction of arrows E and F, which is the tunnel cross-section direction
2 in the form of arrow 3 and following the shield device 5 in FIG.
Excavation tunnel 2 in the form in which it is sequentially connected from the direction A to the direction A.
It is constructed by being built in the s, and each segment 31 is configured by a precast concrete slab that is formed in a block shape in a circular arc shape along the outer circumference of the excavation tunnel 2s. Further, in the lining 3, a fastening bolt and a water stop material (not shown) are provided between the segments 31 and 31 that are adjacent to each other in the arrow A and B directions and the arrow C and D directions.
The tunnels 1 are appropriately arranged by the amount determined by the design specifications of the tunnel 1, that is, the lining 3 is provided in the ground 2 through the connection points between the plurality of segments 31 forming the lining 3. The ground 2 without porosity entering the lining 3
A plurality of segments 31 are integrally connected so that they can support earth pressure, that is, external pressure.

Further, as shown in FIG. 1 or 2, on the arrow E direction side which is the inner side in the tunnel cross section of the lining 3, as shown in FIG. 1 or 2, a metal internal pressure support cylinder, which is an annular steel pipe 6, is formed. But,
The front end 6b, which is the end on the arrow A side, is the front end 3b of the lining 3.
The steel pipe 6 is built and built up here until it is located on the arrow B direction side, which is slightly rearward.
As shown in FIG. 3, a steel plate 61, which is a rigid member in the shape of an arc plate, is formed along the inner peripheral surface 3a of the lining 3 through the steel pipe erector 20 of the shape following the By welding and connecting 4 pieces in the directions of arrows C and D
The width L4 of one ring is the width L1 of the segment 31 of the lining 3
Is formed so as to be extendable by forming a cylindrical shape having a shape corresponding to, and sequentially welding and connecting the same in the directions of the arrows A and B, which are the axial directions of the tunnel.

For example, as shown in FIG. 3, the steel pipe erector 20 has an annular shape having an outer diameter smaller than the inner diameter of the steel pipe 6 so that it can be supported by the already built steel pipe 6 or the lining 3. The girder ring 21 is formed. The girder ring 21 is movable in the directions of arrows A and B, which are the axial directions of the tunnel, via the rolling wheels 22, and the circumference of the tunnel is provided via a turning motor or the like (not shown). Arrow C, which is the direction
It is configured so that it can be rotationally driven and positioned in the D direction. On the girder ring 21, a pair of arms 23, 23, each of which has a gripping portion 25, 25 capable of gripping the steel plate 61, is moved and positioned in the front-rear direction, that is, in the directions of arrows A and B which are the tunnel axis directions. Arrow E, which is free and is in the tunnel cross-section direction
The steel pipe erector 20 is provided with a pair of arms 23, 23 so as to project and retreat in the F direction.
The steel plate 61 gripped by the gripping parts 25, 25 is configured to be movable and positioned at a predetermined built-in position in the tunnel space 9.

The steel pipe 6 forms a gap 10 having a width L2 between the steel pipe 6 and the inner peripheral surface 3a of the lining 3 in an annular shape as an insulating region between the steel pipe 6 and the lining 3, while The steel pipe 6 is built and disposed inside the lining 3 so as to form a tunnel space 9 in the shape of an overturning cylinder inside the steel pipe 6 itself, and the steel pipe 6 is provided with rainwater or the like flowing through the tunnel space 9. Are connected and integrated by welding or the like in such a manner that water does not leak out of the tunnel space 9 from between the plurality of steel plates 61 forming the steel pipe 6, and the steel pipe 6 is in the tunnel circumferential direction. In order to support the internal pressure acting from the tunnel space 9 toward the direction of the arrow F, which is the outer side in the tunnel cross-sectional direction, in a form having a predetermined tensile strength in the direction intersecting with the plane of FIG. 1 shown in the directions of arrows C and D in FIG. Is configured. In addition, between the lining 3 and the steel pipe 6, a buffer material 7 having a width L2 and filling the gap 10 is elastically deformable in the gap 10 and has a substantially circular shape. The buffer material 7 is filled and arranged in a ring shape, and is made of an elastic member made of polyamide resin such as nylon, vinylon resin, or other polymer resin, and the stress generated in the lining 3 and the stress acting on the steel pipe 6 are The lining 3 and the steel pipe 6 are arranged in a gap 10 which is a space for insulating the lining 3 and the steel pipe 6 in a form capable of buffering the mutual transmission. Further, as shown in FIG. 1, a receiving member 19 for supporting the bottom portion 6d of the steel pipe 6 is provided in the lower portion of the gap 10 to support the weight of the steel pipe 6 and the weight of rainwater or the like filled in the tunnel space 9 later. They are arranged so that they can be mounted and supported at predetermined intervals in the directions of arrows A and B, which are the axial directions of the tunnel. In addition, the steel pipe 6 has a shape in which a slight movement is allowed with respect to the lining 3 via the cushioning material 7, while the lining 3
Is fixed and supported on the ground 2 through a cement-based backing material 39 filled between the ground 2 and the side of the lining 3 in the direction of the arrow F, which is the outside in the tunnel cross section. There is. In addition, a rainwater intake port (not shown) is provided in the tunnel 1.
Arrows A and B which are in the axial direction of the tunnel and can communicate with other rainwater channels such as rivers or drains other than the tunnel 1.
The tunnel 1 is openable and closable at a plurality of locations along the direction, and by opening and closing the tunnel 1 at the rainwater intake port, rainwater can be circulated or stopped in the tunnel space 9. .

By the way, the lining 3 during the construction of the tunnel
As shown in FIG. 1 or 3, a temporary steel set 110 formed by assembling H-shaped steel or the like is provided after the shield device 5 in the tunnel space 9 which is a space formed on the inner side of the arrow A. Direction, the temporary steel set 110 is installed in the tunnel space 9 at a predetermined pitch L5 in the directions of arrows A and B, which are the direction of the tunnel axis. Each has a plurality of girders 11 formed in a gate shape. The plurality of girders 11 that constitute the temporary steel set 110 form a steel plate transport line 9b that is a region for transporting the steel plate 61 to the steel pipe erector 20 on the upper side of the girder 11, that is, the upper part of the tunnel space 9. At the same time, a transfer line support member is formed inside the girder 11, that is, below the steel plate transfer line 9b so as to form a segment transfer line 9a which is a region for transferring the segment 31 to the erector 51 of the shield device 5. As a result, the tunnel space 9 under construction is constructed by a plurality of girders 11 of the temporary steel set 110 so that the upper and lower parts thereof are respectively connected to the steel plate conveying line 9b and the segment conveying line 9a. The areas are divided so that they can be used properly.

That is, as shown in FIG. 2, the girder 11 is a supporting steel made of an H-shaped steel or the like, which is temporarily installed in such a manner that two points on the inner peripheral surface 6a of the steel pipe 6 are connected in the lateral direction of FIG. 12 on the supporting steel 12,
Two column steels 13, 13 made of the same H-section steel and the like are erected at a predetermined interval in the left-right direction in FIG. A girder steel 15, which is a horizontal member, is provided on the upper side of the two pillar steels 13, 13 so as to be suspended between the pillar steels 13, 13, and the girder 11 serves as a reinforcing member. Brace steel 18, which is a diagonal material, is used for each column steel 13 and girder steel 1.
It is provided in the form of connecting 5. And girder 1
As shown in FIG. 3, pillar steels 13 and 13 erected on the supporting steel 12 of No. 1 are connected to the supporting steels 12 and 12 adjacent to each other in the directions of arrows A and B as shown in FIG. In the interposition, a pair of rails 17 on which the segment transport carriage 26 can travel are laid so as to be extendable in the direction of arrow A to the rear position of the erector 5a of the shield device 5, that is, in association with the propulsion of the shield device 5. The inside of the girder 11 in the tunnel space 9, that is, the upper side of the support steel 12 and the column steels 13, 13 and the girder steel 1
The area corresponding to the area between 5 is the segment carrier 26
Is a segment transport line 9a, which is a segment transport region in the tunnel space 9, and is free to travel on the pair of rails 17. Therefore, the segment carrier 26 having the segment 31 mounted thereon is configured to be capable of transporting the segment to the position of the erector 51 of the shield device 5 while going back and forth in the segment transport line 9a which is the segment transport area.

On the other hand, on each girder steel 15 of the plurality of girders 11, as shown in FIG. 3, a steel plate carrier truck 27 carrying a steel plate 61 runs in a form of connecting adjacent girder steels 15, 15. The pair of rails 16 to be obtained are laid suspended up to the rear position of the girder ring 21 of the steel pipe erector 20, that is, extendable in the direction of arrow A along with the advance of the steel pipe erector 20, and above the girder 11 in the tunnel space 9. That is, the inner peripheral surface 6 at the upper side of the supporting steel 12 and the arch portion of the steel pipe 6.
A region corresponding to a is a steel plate transport line 9b in the tunnel space 9 in such a manner that the steel plate transport truck 27 can travel on the pair of rails 16. Therefore, the steel plate carrier truck 27 carrying and supporting the steel plate 61 is configured to be capable of carrying the steel plate 61, which is a rigid member, to the position of the steel pipe erector 20 while going back and forth in the steel plate carrying line 9b, which is a rigid member carrying region. ing. Steel plate carrier 2
In the embodiment, for example, 7 has a base 29 that can travel on the rails 16 via wheels 28, and a support surface 30 a that is the upper surface of the base 29 has a steel plate 6 thereon.
1, a canopy 30 formed in a semi-cylindrical shape substantially along the inner peripheral surface 6a of the steel pipe 6 is arranged in the direction of arrows A and B, which are the front-rear direction of the steel plate transport carriage 27. so,
Each of them is provided so that it can be raised and lowered. Then, the steel plate carrier truck 27, as shown in FIG.
Of the steel pipe erector 20 by moving the steel plate transport line 9b from the arrow B direction side toward the arrow A direction with the steel plate 61 mounted and supported on the supporting surface 30a of the steel pipe erector 20. It is configured such that it can be delivered to the gripping portion 25 of the.

Since the tunnel 1 under construction has the above-mentioned structure, when constructing the tunnel 1, other rivers or drainage channels other than the tunnel 1 in the ground 2 are constructed. An excavation tunnel 2s is excavated and formed at a position deeper than the rainwater channel by using an appropriate shield device 5, and a plurality of segments 31 are connected inside the shield device 5 via an erector 51 so as to be arranged along the tunnel circumferential direction. Then, the shield device 5 is followed by the excavation tunnel 2s.
By constructing the lining 3, the lining 3 is constructed and extended. That is, the tunnel 1 has a shape in which rainwater can flow into the tunnel space 9 after the construction is completed from the rainwater canal other than the tunnel 1 through the rainwater intake port with a head difference. Build it. And FIG.
As shown in FIG. 5, an appropriate backing material corresponding to the property of the ground 2 is provided on the arrow F direction side that is the tunnel cross-section outer side of the lining 3 in the form of performing the injection work behind the shield device 5 (arrow B direction). By filling 39 with the lining 3, the lining 3 can support the earth pressure by the ground 2 in the tunnel 1.
The lining is fixed on the ground 2.

By the way, when the excavation and the construction work of the lining 3 are performed through the shield device 5 in this manner, the segment 31 is arranged in the lower part of the tunnel space 9 so as to be formed by the plurality of girders 11. The segment 31 is transported in the directions of the arrows A and B, which are the tunnel axis directions, while being supported by the segment transport carriage 26 that can freely move through the inside 9a. Therefore, for example, after the segment 31 to be transported is mounted on an appropriate segment-mounted segment transport vehicle 26, the segment transport vehicle is mounted on a pair of rails 17 suspended on the support steel 12 of the temporary steel set 110. By traveling 26, the transport line 9 a is sequentially transported to the position of the erector 51 of the shield device 5. In addition, the excavated soil of the ground 2 excavated and formed by the shield device 5,
A segment shuttle line 9a in the tunnel space 9 or the segment transport line 9a is formed by running an appropriate shuttle car on the pair of rails 17 or laying a sludge discharge line at an appropriate position other than the rails 17. The excavated soil is carried out by utilizing the region 9c between the lower side of the support steel 12 and the bottom portion 6d of the steel pipe 6 which is further below.

Meanwhile, in the lining 3 being constructed,
In the direction of the arrow B in FIG. 2 from the front end 3b of the lining 3, which is the rear side of the shield device 5, a steel plate 61 is connected and built along the inner peripheral surface 3a of the lining 3 via the steel pipe erector 20. By doing so, the steel pipe 6 is attached to the lining 3 on the arrow E direction side which is the inner side in the tunnel cross-section direction of the lining 3.
A second lining in the tunnel 1 is constructed and extended by forming a gap 10 having a width L2 between the inner peripheral surface 3a and the inner peripheral surface 3a. Then, when the steel pipe 6 is built inside the lining 3, at the same time as or before or after this, the steel pipe 6 between the steel pipe 6 and the inner peripheral surface 3 a of the lining 3 is Bottom 6d
The receiving members 19 for mounting and supporting are arranged at a predetermined interval, and the cushioning material 7 is laid or filled in a shape having a width L2 corresponding to the gap 10.

In order to build the steel plate 61 on the inner side of the lining 3, the steel plate 61 is moved in a steel plate transport line 9b which is formed by a plurality of girders 11 and is arranged above the tunnel space 9. While being supported by the existing steel plate carrier truck 27, the steel plate 61 is transferred in the directions of the arrows A and B which are the tunnel axis directions. Therefore, first, a steel plate 61 is supported by being mounted on the two canopies 30, 30 of the steel plate carrier 27, and the steel plate carrier 27 is suspended and laid on the girder steel 15 of the temporary steel set 110. By traveling on the pair of rails 16, the steel plate transport line 9b is transported to the position of the steel pipe erector 20. Then, the steel plate transport carriage 27 is connected to the steel plate transport line 9b.
The canopy 30 on which the steel plate 61 is mounted and supported is arranged at the rear end of the rail 16 and the rearmost position of the rail 16 at the rear side of the girder ring 21 of the steel pipe erector 20.
Increase to 9. In this state, the steel pipe erector 20
The girder ring 21 is rotated in the direction of arrow C or D, which is the circumferential direction of the tunnel, so that the pair of arms 23 and 23 are gripped by the gripping portions 25 and 25 of the steel plate 6 supported by the canopy 30.
The inner peripheral side of 1 is aligned and positioned so that it can be gripped. Then, by lowering the canopy 30, the steel plate 61 is transferred to and supported by the pair of arms 23, 23,
The steel plate 61 is transferred to the steel pipe erector 20 side as shown by the alternate long and short dash line in FIG. From this state, the steel pipe erector 20
For example, the girder ring 21 is rotationally positioned in the directions of arrows C and D via a turning motor or the like, and the pair of arms 2 is used.
By moving and positioning 3, 3 and 23 in the front-rear direction, that is, in the directions of the arrows A and B, which are the tunnel axis directions, the arm 23 is positioned at a position where the steel plate 61 is to be newly connected in the steel pipe 6 that has already been formed. , 23, after moving and positioning the steel plate 61, the holding parts 25, 25 are projected and moved in the direction of the arrow F, which is the outer side in the tunnel cross-section direction, to build the steel pipe 61 as shown in FIG. Place in position. Then, the steel pipe 61, which is now arranged at the built-in position, is welded to the already formed steel pipe 6 by an appropriate welding means to extend the connection of the steel plates 61, that is, the construction of the steel pipe 6. On the other hand, the steel plate carrier truck 27 which has delivered the steel plate 61 to the pair of arms 23, 23 of the steel pipe erector 20 again has the arrow B which is the rear side on the rail 16.
In the form of traveling in the direction, the steel sheet is moved in the steel sheet conveying line 9b to prepare for the conveyance work of the new steel sheet 61 to be built next to the steel sheet 61 that has been completely built and joined. Since each steel plate 61 is a member for forming the steel pipe 6 for supporting the internal pressure in the tunnel 1, its thickness is relatively thin, and therefore the steel plates 61 are
Is lighter than each segment 31. Therefore, an excessive weight load acts on each girder 11 via the steel plate carrier truck 27 and the rail 16 to cause the girder 11 to move.
There is no risk that the steel pipe will be broken or the already constructed steel pipe 6 will be distorted. Further, since the steel plate 61 is light in weight, the vibration caused by the steel plate transport carriage 27 that transports the steel pipe 61 traveling on the rail 16 in the steel plate transport region 9a which is the upper region in the tunnel space 9 is extremely small. It can be suppressed. Such a series of transportation and installation work of the steel plate 61 can be carried out completely independently without any interference between the excavation work in the shield device 5 and the transportation and installation work of the segment 31 described above. During the transportation and installation work of
On the shield device 5 side, the next work cycle following the above-mentioned excavation work and the building work of the segment 31 is the steel pipe 6
It is carried out separately from the construction work on the side, that is, the construction works for both the lining 3 and the steel pipe 6 proceed simultaneously.

Therefore, the excavation by the shield device 5 and the erection and construction work of the lining 3 in the form of carrying and connecting the segments 31 and the steel pipe 6 in the form of carrying and connecting the steel plate 61 by the steel plate carrying carriage 27 and the steel pipe erector 20. The building construction work is different from the building position of the segment 31 or the steel plate 61 in the tunnel space 9 in such a manner that the segment 31 or the steel plate 61 is moved back and forth in the directions of the arrows A and B which are the tunnel axis directions. Since the segment transport line 9a and the steel plate transport line 9b, which are the transport regions, divide the respective transport regions into the lower part and the upper part of the tunnel space 9, the shield device 5 always precedes the steel pipe erector 20. The girders 11 are built at every predetermined pitch L5 along with the forward movement, and temporarily installed. If it formed a shape of the work progress step of extending the Lumpur 16 and rail 17, whereby the lining 3
And the steel pipe 6 can be efficiently constructed at the same time.
That is, since the segment 31 and the steel plate 61 can be simultaneously transported in the segment transport region 9a and the steel plate transport region 9b in the tunnel space 9 without interfering with each other, the mutual transport waits for completion. By not having to do so, the construction of the lining 3 and the construction of the steel pipe 6 on the inner side of the lining 3 can be efficiently advanced at the same time,
Tunnel 1 can be completed within a short period of time.

When the construction of the tunnel 1 is completed in this way, as shown in FIG. 3, in the tunnel 1, the ground 2 arranged on the arrow F direction side, which is the outer side in the tunnel cross-section direction of the lining 3.
However, the earth load, that is, the external pressure, in the form of pushing out into the region that has become a hollow portion due to the formation of the excavation tunnel 2s,
It acts on the lining 3 from the arrow F direction side toward the E direction side.
With respect to the soil load, the lining 3 is formed so as to resist the compressive strength of the segment 31 forming the lining 3 in a shape having a winding thickness L3 in the arrow E and F directions which are tunnel cross-sectional directions. , Its destruction is prevented. The earth load is distributed and supported along the outer peripheral surface 3c of the lining 3 in which a plurality of segments 31 are connected and integrated via fastening bolts, and the earth load is supported in the entire circumference of the lining 3. Since the shape of the lining 3 is changed, a part of the lining 3 is prevented from being locally deformed by the soil load. Further, the pore water in the ground 2 is stopped by a water blocking material (not shown) provided in the lining 3, and the pore water penetrates into the inner side of the lining 3 and Leakage is prevented from occurring. Further, even if the pore water in the ground 2 leaks to the inside of the lining 3, if the pore water just leaked is drained to the outside of the tunnel 1 using an appropriate drainage facility, the outside of the steel pipe 6 Since the gap 10 between the lining 3 and the lining 3 is filled with the cushioning material 7, the leaked pore water directly contacts the steel pipe 6 and the outer peripheral surface 6c side, which is difficult to repair, corrodes. There is no danger of Also, tunnel 1
In the above, since the gap 10 is not left as a space portion, the outer peripheral surface 6c of the steel pipe 6 is not exposed to the air, so that the steel pipe 6 is guaranteed to have a long useful life.

When heavy rain occurs in the area corresponding to the tunnel 1 and the amount of precipitation exceeds the capacity that can be processed through the rainwater canal other than the tunnel 1, the rainwater intake of the tunnel 1 When the mouth is opened, the tunnel 1 has a structure in which the rainwater or the like from other rainwater channels other than the tunnel 1 can flow into the tunnel space 9 with a water head difference through the rainwater intake port. Rainwater, etc. that had been distributed in the rainwater canal up to that point from the place where it was constructed and arranged in a region deeper than the waterway, etc., into the tunnel space 9 of the tunnel 1 via the rainwater intake port in the open state, It flows in in a form of being press-fitted with a water head difference, and is transported and processed in a form of being drained to the downstream side (not shown) using the tunnel space 9 as a flow path. As a result, in the rainwater canal other than the tunnel 1 in the area shallower than the tunnel 1 in the ground 2, the circulation amount of rainwater or the like is reduced, and the rainwater or the like overflows from the rainwater canal to the ground. Floods will be prevented. By the way, when water is passed through the tunnel space 9, an internal pressure corresponding to the head difference is applied to the steel pipe 6 from the direction of the arrow E to the direction F.
It acts in such a way as to face the direction side. Then, the steel pipe 6
Supports the internal pressure, which acts from the arrow E direction side toward the F direction side, in a planar manner via the inner peripheral surface 6a of the steel pipe 6. That is, the steel pipe 6 is generated by the generation of the internal pressure acting in the directions of the arrows E and F which are the tunnel cross-section directions.
In the tunnel circumferential direction in which the steel pipe 6 expands, the internal force is generated in the directions of the arrows C and D, which are the circumferential direction of the tunnel. The steel pipe 6 applies the internal force in the circumferential direction of the tunnel held by the steel pipe 6. It resists the tensile strength of the shape along the arrow C, D direction,
This prevents the steel pipe 6 from breaking. Further, when the steel pipe 6 expands in its elastic deformation region, the cushioning member 7 disposed on the arrow F direction side which is the tunnel cross-section outer side of the steel pipe 6 is held by the cushioning member 7. This is deformed and elastically deformed and is allowed to be absorbed, thereby buffering the internal pressure acting on the lining 3 side. Thus, the tunnel 1 appropriately drains rainwater to prevent flooding by allowing the steel pipe 6 to exclusively support the internal pressure generated when the tunnel space 9 is used as a groundwater channel without propagating to the lining 3 side. It can be used as a tunnel structure that can be used.

In the above embodiment, the ground 2
In order to construct the lining 3 that is the first lining in the excavation tunnel 2s that has been excavated and formed in the segment transportation line 9a, the segment transportation vehicle 26 equipped with the segment 31 is installed.
Is carried by moving back and forth on the rail 17, and the carried segment 31 is built up by the erector 51 of the shield device 5, while the second lining is provided on the inner side of the lining 3. In order to construct a certain steel pipe 6, in the steel plate transport line 9b, a steel plate transport carriage 27 is mounted on and supported by a canopy 30 of steel plates 61 each having a shape of one ring of the steel pipe 6 in pairs. An example was described in which the steel plate 61 is transported by moving back and forth, and the steel plate 61 transported is built by the steel pipe erector 20 having the girder ring 21. The construction of the segment building means, or the rigid member carrying means such as the steel plate carrying carriage 27 and the rigid member building means such as the steel pipe erector 20 are actually configured. What, etc. no problem with a configuration other than those described in the example. In addition, the steel plate 61 is the first lining 3 or the like.
By being connected along the inner peripheral surface 3a of the lining,
The shape of the steel sheet 61 is not limited to the shape of the steel plate 61 as long as it is a rigid member that can serve as the second lining arranged on the inner side of the first lining. is there. Further, in the tunnel space 9, the segment transfer area such as the segment transfer line 9a and the steel plate transfer line 9 are connected.
The structure and the arrangement pitch of the girders 11 for forming the steel plate conveying region such as b may be those other than those used in the embodiment. Further, in the embodiment, the example of constructing the tunnel 1 for the underground river for flood prevention by using the tunnel construction method according to the present invention is described, but the application of the present invention is limited to the tunnel 1 for the underground river. It is not something that will be done.

[0022]

As described above, according to the present invention, the first lining such as the lining 3 is constructed so as to support the earth pressure by the ground 2, and the inner side of the first lining is constructed. In the tunnel building method, a second lining such as a steel pipe 6 is formed on the side in a manner of connecting a plurality of rigid members such as a steel plate 61 along the inner peripheral surface such as the inner peripheral surface 3a of the first lining. , A transfer line supporting member such as a girder 11 is provided in the tunnel space 9 formed on the inner side of the first lining, and a steel plate transfer line 9b is provided above the tunnel space 9.
And the like, and at the same time form a rigid member carrying area such as a segment carrying area such as a segment carrying line 9a below the rigid member carrying area. The segment transport area formed by the support member is transported in the tunnel axial direction while being supported by a segment transport means such as a segment transport carriage 26 that can move back and forth, thereby constructing the first lining and the rigidity. The member is conveyed in the tunnel axis direction while being supported by a rigid member conveying means such as a steel plate conveying carriage 27 that can move back and forth in the rigid member conveying region formed by the conveying line support member, and the second member is conveyed. Since the lining was constructed so that during the tunnel construction work, the segment transportation area is moved back and forth to the segment transportation means in the tunnel space 9. That while conveying the segment 31 in the form, it is possible to transport the rigid member in the form to traverse the rigid member conveying area to the rigid member conveying means. Then,
The rigid member can be transported and built in any process without having to wait for each process of carrying in the segment or carrying out the excavated earth and sand to complete its process. That is, the transport of the segment 31 required for constructing the first lining and the transport of the rigid member required for constructing the second lining are respectively performed in the tunnel space 9. By differentiating the transport area and the transport means from each other, the transport operations do not interfere with each other, and both transport operations can proceed at the same time. Therefore, if the construction position of the segment 31 and the construction position of the rigid member are moved back and forth in the axial direction of the tunnel and the construction positions are made different, the construction of the first lining and the construction of the second lining will be completed. ,
It is possible to efficiently perform simultaneous construction in such a manner that both the transportation work of the segment 31 and the rigid member configuring these and the built-in position thereof do not interfere with each other at all. Therefore, according to the present invention, in an underground river tunnel,
Even when the lining member for supporting the internal pressure, that is, the second lining is built inside the first lining for supporting the external pressure, the lining member for supporting the external pressure and the lining member for supporting the internal pressure are built. It is possible to carry out the tunneling efficiently at the same time and perform good tunnel construction during a short construction period.

[Brief description of drawings]

FIG. 1 is a sectional side view showing an example of a tunnel being constructed by a tunnel construction method according to the present invention.

FIG. 2 is a sectional view taken along the line II and II in FIG.

3 is a cutaway perspective view of the tunnel shown in FIG. 1. FIG.

[Explanation of symbols]

 2 ... Ground 3 ... First lining (lining) 3a ... Inner peripheral surface 31 ... Segment 6 ... Second lining (steel pipe) 61 ... Rigid member (steel plate) 9 ... Tunnel space 9a: segment transfer area (segment transfer line) 9b: rigid member transfer area (steel plate transfer line) 11: transfer line support member (guarder) 26: segment transfer means (segment transfer cart) 27: rigid member transfer Means (steel plate carrier)

Claims (1)

[Claims] 1. A first lining is constructed in a form capable of supporting earth pressure by the ground, a second lining is provided on the inner side of the first lining, and a second lining is provided inside the first lining. In a tunnel construction method for constructing a plurality of rigid members connected along a circumferential surface, a transport line support member is provided in a tunnel space formed on an inner side of the first lining, and a transport line support member is provided above the tunnel space. In the segment transfer area formed by the transfer line supporting member, a member transfer area is formed and a segment transfer area is formed below the rigid member transfer area at a predetermined pitch so that the segment transfer area can be formed. Is transported in the tunnel axial direction while being supported by a freely movable segment transport means to construct the first lining, and the rigid member is configured to transport the rigid member to a rigid member transport region formed by the transport line support member. Rigid part that can freely move in and out And conveyed in the tunnel axis direction while supported on the conveying means, and configured so as to build the second lining, tunnel construction method.